Это сделало свою работу!
self.driver.window_handles
wait = WebDriverWait(self.driver, 10)
base = self.driver.window_handles[0]
child = self.driver.window_handles[1]
windows = {self.driver.window_handles[0], self.driver.window_handles[1]}
for x in windows:
if(base != x):
self.driver.switch_to.window(x)
frame = wait.until(EC.presence_of_element_located((By.NAME, "mainFrame")))
self.driver.switch_to.frame(frame)
element = wait.until(EC.element_to_be_clickable((By.ID, "mc-lnk-moreInfo")))
element.click()